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This module explains how to write a program that creates an audio output consisting of a 1000 Hz square wave in a format that is accessible to blind students.

Table of contents


This module is part of a collection titled Accessible Objected-Oriented Programming Concepts for Blind Students using Java . It explains how to write a program that creates an audio output consistingof a 1000 Hz square wave.

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  • Listing 1 . Beginning of the class named SquareWave.
  • Listing 2 . Beginning of the getMelody method.
  • Listing 3 . Local working variables.
  • Listing 4 . Set the frequency of the square wave.
  • Listing 5 . Decompose val into two bytes.
  • Listing 6 . Populate the audio data array.
  • Listing 7 . The class named AudioFormatParameters01.
  • Listing 8 . The class named AudioPlayOrFile01.
  • Listing 9 . The class named AudioSignalGenerator02.
  • Listing 10 . The class named MusicComposer05.
  • Listing 11 . The class named SquareWave.

General background information

What is sound ?

An earlier module titled Jbs2000-What is Sound? explained some of the physical characteristics of sound. It also explained that sound can beproduced when a computer program causes the diaphragms on audio speakers connected to the computer to move back and forth or vibrate.

White noise

An earlier module titled Jbs2010-Your First Sound Program explained how a random number generator can be used in a program to cause the speakerdiaphragms to move back and forth or vibrate in a random fashion producing what is commonly called white noise or pink noise. (Click WhiteNoise to hear a sample of white or pink noise. You should be able to play the audio file with any standard mediaplayer that can handle the AU file type. In case you are on the OpenStax site and you are unable to download the audio file, click the Legacy Site link at the top of this page to switch over to the same module on the Legacy site.You shouldbe able to download the audio file from there.)

White noise is totally unorganized or random. Beginning with this module, we will start applying more organization to the sound until we reach the pointwhere we can write a program that simulates a player piano. (Click Greensleeves to hear a simulation of a player piano.)

A square wave

In this module, we will write a program that attempts to cause the diaphragms to move back and forth instantaneously switching from one position to another by creatingaudio data based on a square wave. (Click SquareWave to hear a sample of a 1000 Hz square wave. A future module will compare the sound of a 1000 Hzsquare wave with the sound of a pure 1000 Hz sinusoidal tone.)

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
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Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
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industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Accessible objected-oriented programming concepts for blind students using java. OpenStax CNX. Sep 01, 2014 Download for free at https://legacy.cnx.org/content/col11349/1.17
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